Guides: read the spec before you spend
You want to understand a recovery device before you buy it, and the box is no help: it leads with the one number that flatters the product. These are plain-English explainers, one per spec that actually decides what you get. Start with whatever you are shopping for. Each one tells you the single thing that matters most, and the marketing trick to read past.
- Red light irradiance explained: why distance is the whole game
Why a mW/cm² number is meaningless without a stated distance, the surface-reading trick, and what to look for instead.
- FDA cleared vs FDA registered: almost no red light panel is cleared
What 'registered', 'listed', and '510(k) cleared' mean, and why nearly every consumer panel - including Joovv and Kineon - is not actually cleared.
- Cold plunge vs ice bath: what a built-in chiller actually buys you
The difference between a self-chilling plunge and a tub you fill with ice: temperature hold, ongoing cost, water care, and why the two are not the same product.
- Cold plunge running costs: the electricity bill brands leave off the box
Why the chiller's electricity is the cold-plunge cost almost no brand discloses, how insulation changes it, and the true cost of a self-chilling plunge vs an ice-only tub.
- Does a cold plunge work less well in summer? The science on water temperature
Summer heat pushes plunge water warmer, and the recovery evidence clusters below 59 F. What a 60 F August plunge versus a 45 F February one actually changes.
- Is a sauna safe to use in summer heat? The dehydration risk summer adds
Summer means you arrive at the sauna already fluid-depleted. The 2% body-mass threshold, the sweat arithmetic on one session, and when to skip.
- Low-EMF infrared saunas: why the number means nothing without a position
Why a sauna's low-EMF claim is only usable as a milligauss figure measured at the seated body position, the at-the-heater trick, and what full spectrum should mean.
- Full spectrum vs far infrared: what 'full spectrum' should mean
Why full spectrum is the most stretched sauna claim, what near, mid, and far infrared are, and why the label is only honest with a separate near-infrared emitter.
- PEMF field claims explained: why 'up to X gauss' is not a spec
Why a PEMF field claim is only usable as a field strength in real units at a stated frequency, the peak-gauss and unit-less-level tricks, and why a real FDA 510(k) clearance is rare.
- FDA cleared vs FDA registered PEMF: why almost nothing is cleared
What 'FDA registered', 'listed', and '510(k) cleared' mean for a PEMF device, why a real clearance is rare in consumer PEMF, and how to read the marketing.
- Portable red light therapy for travel: fit-for-purpose, not a new score
Why small targeted panels win on weight rather than on our panel score, the four catalog devices that travel well, and why the wearable sub-rubric is still v1.
- How to build an outdoor backyard recovery station for 2026: cold plunge, sauna, and space planning
Footprint, electrical draw using our per-model chiller estimates, water and drainage, weatherproofing, and tiered budget combos from the scored catalog.
- How to choose a red light panel: a spec-first buying guide
The five things that actually decide a panel - measured irradiance at distance, wavelengths, EMF and flicker, real cost per area, and build - plus budget tiers.
- Red light wavelengths explained: what 660 nm and 850 nm actually do
What a wavelength is, why 660 nm and 850 nm are the studied bands, the other bands you see on a spec sheet, and whether more wavelengths is actually better.
- Red light EMF and flicker: the two specs panel brands rarely publish
Where panel EMF comes from, why a flicker-free driver matters, and why silence on both is itself a signal when you read a spec sheet.
- Red light dosing and timing: how irradiance, distance, and minutes fit together
Dose is irradiance times time, distance changes the number, and a surface figure inflates the dose you think you are getting. Informational, not medical advice.
- How to choose an infrared sauna: EMF, spectrum, and what the price buys
Format, a low-EMF figure verified at the seat, a real full-spectrum emitter, a safety listing, and value - the spec-first way to read an infrared sauna.
- Infrared sauna heater types: carbon, ceramic, and incandescent near-infrared
How carbon, ceramic, hybrid, and incandescent near-infrared heaters differ, and why heater type is upstream of the spectrum and EMF we score most.
- How to choose a cold plunge: chiller, size, and the costs brands leave off
A real built-in chiller vs an ice-only tub, sizing and placement, water care, the running cost most brands omit, and budget tiers from the scored catalog.
- How to choose a PEMF device: reading a real field spec past the gauss headline
Why a field strength in real units at a stated frequency beats a peak-gauss headline, plus frequency and waveform disclosure, FDA honesty, and value tiers.
- Five spec traps in recovery gear, and how to read past them
The recurring spec tricks across red light, sauna, PEMF, and cold plunge marketing - surface irradiance, EMF off the seat, peak gauss, ice tubs, registered vs cleared - and the question that defuses each.
- Infrared sauna vs traditional sauna: heat, temperature, and what we score
How infrared and traditional saunas heat you differently, the temperature gap, and why our scoring covers infrared specifically.
Each guide takes one spec we score and the marketing trick around it, and walks you through reading it for yourself. More are added as we expand the rubrics.